Trelock combination locks with armoured cables offer a high level of security against casual thieves. The PK 310 is secure from lock-picking and equipped with a freely selectable numerical code. Furthermore, it has the Trelock locking cylinder with Precision Lock technology.

The Trelock PK 310 numerical lock with holder is lightweight, has easy-to-read, easy-to-read dial rings and a surprisingly flexible armor cable. The bright LED lighting is helpful. Breaking safety seems to be mediocre for this weight class. The lock body is somewhat chunky. Panzerkabel is long enough.